package com.mmall.concurrency.example.atomic;

import com.mmall.concurrency.annotations.ThreadSafe;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;

/**
 * @author stone
 * @des AtomicReferenceFieldUpdater
 * @date 2019/2/19/019 11:53
 **/
@Slf4j
@ThreadSafe
public class AtomicExample5 {

    private static AtomicIntegerFieldUpdater<AtomicExample5> updater = AtomicIntegerFieldUpdater.newUpdater(AtomicExample5.class, "count");

    @Getter
    // 注意这个字段 不能是私有的
    // volatile 程度较轻的 synchronized
    public volatile int count = 100;

    public static void main(String[] args) {

        AtomicExample5 example5 = new AtomicExample5();

        if (updater.compareAndSet(example5, 100, 120)) {
            log.info("update success 1, {}", example5.getCount());
        }

        if (updater.compareAndSet(example5, 100, 120)) {
            log.info("update success 2, {}", example5.getCount());
        } else {
            log.info("update error, {}", example5.getCount());
        }

    }

}
